The 528E Voice Processor was designed many, many years ago. The first version of the 528E hit the market in 1987. As is our style, we continuously improved the 528E. For better rejection of RF frequencies we redesigned the mic preamp. We minimized noise in the EQ section. We switched to a toroid power transformer to diminish hum. It may have been luck. Or, it may have been the fact that we were the first to put great sounding mic pre, de-esser, downward expander, parametric EQ and waveform symmetry filter all under one hood. In any event, what happened was, over time the 528E became ubiquitous in US radio stations and production studios.
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